watermelon mushrooms wont grow

I'm kinda sorta new to the reef seen and a vetran to freshwater so basically when I first started I bought a mushroom frag with 3 shrooms on the rock later on added other soft corals to the tank its been bout 2 months now and everything else has grown very well but all the change I can notice to the mushrooms as that they have grown from dime size to nickel size but have not split/spread there in a low flow area with low/moderate light I heard they grow faster than anything so plz help also all water specs are in check and theres no coral next to them or anything

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